Computer & Network Engineer

public constructor(){ setLayout(new GridLayout(5,10)); }

public constructor(){ setLayout(new FlowLayout(FlowLayout.LEFT)); }

myButton.setBackground(Color.WHITE); myButton.setForeground(Color.RED);

myWindow.setVisible(true);

myWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

myWindow.setSize(500,250);

كذا نكون خلصنا من اسئلة الكتاب لشابتر 11 وحبدأ باسئلة بشابتر 12

FileOutputStream out = new FileOutputStream("ObjectData.dat"); ObjectOutputStream ostream = new ObjectOutputStream(out); ostream.writeObject(r);

RandomAccessFile randomFile = new RandomAccessFile("Customers.dat", "rw");

FileOutputStream fstream = new FileOutputStream("Configuration.dat");

try{ int n = getValueFromFile(); } catch ( IOException e){ System.out.println(e.getMessage()); } catch ( FileNotFoundException e){ System.out.println(e.getMessage()); }

public int getValueFromFile() throws IOException, FileNotFoundException { }

throw new NegativeNumber(-5); OR throw new NegativeNumber();

public class NegativeNumber extends Exception { public NegativeNumber() { super("Error: Negative number"); } public NegativeNumber(int n) { super("Error: Negative number: " + n); } }

throw new IllegalArgumentException("Argument cannot be negative.");

public static int arraySearch( int[] array, int value) throws Exception { int index = -1; for ( int i =0; i< array.length ; i++){ if ( array[i] == value){ index = i ; break; } } if ( index == -1 ){ throw new Exception("Element not found."); } else return Iindex; }

The output is B D E

هنا ترتيب ال catches غلط المفروض نبدأ بالتخصيص بعدين العام ، المفروض كدا الحل.. try { number=Integer.parseInt(str); } catch (IllegalArgumentException e) { System.out.println("Bad number format."); } catch (NumberFormatException e) { System.out.println(str + " is not a number."); } catch (Exception e) { System.out.println(e.getMessage()); }

نفس الشيء هنا الترتيب خطأ المفروض catch قبل finally... المفروض كدا try { input = inputFile.nextInt(); } catch (InputMismatchException e) { System.out.println(e.getMessage()); } finally { inputFile.close(); }